The 11th annual CITO weekend is being held on April 20, 21 and 22nd, 2013. There are hundreds of events in dozens of countries that you may wish to attend. If you do participate in an event that weekend, you get a special souvenir from Groundspeak for your geocaching.com profile.
For more information, check out the CITO page on geocaching.com to learn more about CITO events, and to find (or host) an event in your area. You could make a difference AND make new friends - don't miss out on that deal!